Meghan McCain Skips Book Signing to Party in Vegas, Gets Busted By Own Twitter Page

There's a lesson in this story. That lesson is not to Tweet about your real whereabouts when you make up a BS excuse to get out of a speaking engagement.

With three days' notice, Meghan McCain canceled an appearance at Pennsylvania's Juniata College due to "several unforeseen professional responsibilities."

As in partying in Vegas, baby!

It's hard to fly under the radar when you Tweet 24/7.

McCain's Twitter account reveals this: "First real time off in months - was gonna rest up for phase two next week of my Dirty Sexy Politics book tour ... But headed to sin city with my favorite crew of sinners instead ... Viva Las Vegas baby."

And McCain kept on tweeting: No apology to the college, just a hissy fit about how the MGM messed up her hotel reservation and her move to the Palms.